Weaver, E. Eugene Product Development Group, Ford Motor Company, Dearborn, Michigan.
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A mixture of one part by volume of concentrated nitric acid and three parts of concentrated hydrochloric acid. Aqua regia was so named by the alchemists because of its ability to dissolve platinum and gold. Either acid alone will not dissolve these noble metals. Although chlorine gas and nitrosyl chloride are formed as indicated in reaction (1), the oxidizing properties of aqua regia are not believed to be increased. Instead, the metal is easier to oxidize because of the high concentration of chloride ions which form a stable complex ion as illustrated with gold in reaction (2). See also: Chlorine; Gold; Nitric acid; Platinum
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